Why burn the supplies?

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So when Daenerys, Drogon and the Dothraki attack the supply train, why does she also burn the supplies? It would make more sense to set Drogon against the Lannister soldiers, who are clustered together and make a big target for Drogon, and send the Dothraki after the supplies for her forces to use. An army doesn’t just fight, it also has to feed itself; Dothraki aren’t particularly great against lines of troops as the Unsullied proved. Besides, it’s rather bad for publicity for Daenerys to be burning supplies, since Winter is Coming and the smallfolk will starve without food (obviously), making it easier to support Cersei.